alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (AsciiTest.java)

This example Java source code file (AsciiTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abcdefghijklmnopqrstuvwxyz, asciitest, foobar, gwtcompatible, gwtincompatible, ignored, illegalargumentexception, lower, password, string, testcase, upper

The AsciiTest.java Java example source code

/*
 * Copyright (C) 2010 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.base;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;

import junit.framework.TestCase;

/**
 * Unit test for {@link Ascii}.
 *
 * @author Craig Berry
 */
@GwtCompatible
public class AsciiTest extends TestCase {

  /**
   * The Unicode points {@code 00c1} and {@code 00e1} are the upper- and
   * lowercase forms of A-with-acute-accent, {@code Á} and {@code á}.
   */
  private static final String IGNORED =
      "`10-=~!@#$%^&*()_+[]\\{}|;':\",./<>?'\u00c1\u00e1\n";
  private static final String LOWER = "abcdefghijklmnopqrstuvwxyz";
  private static final String UPPER = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

  public void testToLowerCase() {
    assertEquals(LOWER, Ascii.toLowerCase(UPPER));
    assertSame(LOWER, Ascii.toLowerCase(LOWER));
    assertEquals(IGNORED, Ascii.toLowerCase(IGNORED));
    assertEquals("foobar", Ascii.toLowerCase("fOobaR"));
  }

  public void testToUpperCase() {
    assertEquals(UPPER, Ascii.toUpperCase(LOWER));
    assertSame(UPPER, Ascii.toUpperCase(UPPER));
    assertEquals(IGNORED, Ascii.toUpperCase(IGNORED));
    assertEquals("FOOBAR", Ascii.toUpperCase("FoOBAr"));
  }

  public void testCharsIgnored() {
    for (char c : IGNORED.toCharArray()) {
      String str = String.valueOf(c);
      assertTrue(str, c == Ascii.toLowerCase(c));
      assertTrue(str, c == Ascii.toUpperCase(c));
      assertFalse(str, Ascii.isLowerCase(c));
      assertFalse(str, Ascii.isUpperCase(c));
    }
  }

  public void testCharsLower() {
    for (char c : LOWER.toCharArray()) {
      String str = String.valueOf(c);
      assertTrue(str, c == Ascii.toLowerCase(c));
      assertFalse(str, c == Ascii.toUpperCase(c));
      assertTrue(str, Ascii.isLowerCase(c));
      assertFalse(str, Ascii.isUpperCase(c));
    }
  }

  public void testCharsUpper() {
    for (char c : UPPER.toCharArray()) {
      String str = String.valueOf(c);
      assertFalse(str, c == Ascii.toLowerCase(c));
      assertTrue(str, c == Ascii.toUpperCase(c));
      assertFalse(str, Ascii.isLowerCase(c));
      assertTrue(str, Ascii.isUpperCase(c));
    }
  }

  public void testTruncate() {
    assertEquals("foobar", Ascii.truncate("foobar", 10, "..."));
    assertEquals("fo...", Ascii.truncate("foobar", 5, "..."));
    assertEquals("foobar", Ascii.truncate("foobar", 6, "..."));
    assertEquals("...", Ascii.truncate("foobar", 3, "..."));
    assertEquals("foobar", Ascii.truncate("foobar", 10, "…"));
    assertEquals("foo…", Ascii.truncate("foobar", 4, "…"));
    assertEquals("fo--", Ascii.truncate("foobar", 4, "--"));
    assertEquals("foobar", Ascii.truncate("foobar", 6, "…"));
    assertEquals("foob…", Ascii.truncate("foobar", 5, "…"));
    assertEquals("foo", Ascii.truncate("foobar", 3, ""));
    assertEquals("", Ascii.truncate("", 5, ""));
    assertEquals("", Ascii.truncate("", 5, "..."));
    assertEquals("", Ascii.truncate("", 0, ""));
  }

  public void testTruncateIllegalArguments() {
    String truncated = null;
    try {
      truncated = Ascii.truncate("foobar", 2, "...");
      fail();
    } catch (IllegalArgumentException expected) {}

    try {
      truncated = Ascii.truncate("foobar", 8, "1234567890");
      fail();
    } catch (IllegalArgumentException expected) {}

    try {
      truncated = Ascii.truncate("foobar", -1, "...");
      fail();
    } catch (IllegalArgumentException expected) {}

    try {
      truncated = Ascii.truncate("foobar", -1, "");
      fail();
    } catch (IllegalArgumentException expected) {}
  }

  public void testEqualsIgnoreCase() {
    assertTrue(Ascii.equalsIgnoreCase("", ""));
    assertFalse(Ascii.equalsIgnoreCase("", "x"));
    assertFalse(Ascii.equalsIgnoreCase("x", ""));
    assertTrue(Ascii.equalsIgnoreCase(LOWER, UPPER));
    assertTrue(Ascii.equalsIgnoreCase(UPPER, LOWER));
    // Create new strings here to avoid early-out logic.
    assertTrue(Ascii.equalsIgnoreCase(new String(IGNORED), new String(IGNORED)));
    // Compare to: "\u00c1".equalsIgnoreCase("\u00e1") == true
    assertFalse(Ascii.equalsIgnoreCase("\u00c1", "\u00e1"));
    // Test chars just outside the alphabetic range ('A'-1 vs 'a'-1, 'Z'+1 vs 'z'+1)
    assertFalse(Ascii.equalsIgnoreCase("@", "`"));
    assertFalse(Ascii.equalsIgnoreCase("[", "{"));
  }

  @GwtIncompatible // String.toUpperCase() has browser semantics
  public void testEqualsIgnoreCaseUnicodeEquivalence() {
    // Note that it's possible in future that the JDK's idea to toUpperCase() or equalsIgnoreCase()
    // may change and break assumptions in this test [*]. This is not a bug in the implementation of
    // Ascii.equalsIgnoreCase(), but it is a signal that its documentation may need updating as
    // regards edge cases.

    // The Unicode point {@code 00df} is the lowercase form of sharp-S (ß), whose uppercase is "SS".
    assertEquals("pa\u00dfword".toUpperCase(), "PASSWORD");    // [*]
    assertFalse("pa\u00dfword".equalsIgnoreCase("PASSWORD"));  // [*]
    assertFalse(Ascii.equalsIgnoreCase("pa\u00dfword", "PASSWORD"));
  }
}

Other Java examples (source code examples)

Here is a short list of links related to this Java AsciiTest.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.